Paint gun



w un H. w.L ROSE Aug. 27, 1929.

PAvINT GUN Filed Feb. 16. 1928 Patented Aug. 27, '1929.

UNITED STATES 1,726,412 PATENT OFFICE.

HENRY 'W'. ROSE, 0F GALVESTON, TEXAS,` ASSIGNOR 0F ONE-"HALF T0 ARTHUR GRIGG, OF GALVESTON, TEXAS.

PAINT GUN.

Application filed February 16,y 1928. Serial No. 254,761.

The invention relates to paint guns of the typeadaptedl to deliver a spray or stream of paint and 4has for its object the provisionl of a device of the type referred to employing a screw conveyor for delivering the paint to a nozzle, said conveyor being actuated by an electric motorthe device being of a portable character.

lThe invention will be described in detail hereinafter and will be found illustrated in the accompanying drawings in which Figure l is a side View partly broken away of the improved paint gun, and

Figure 2 is a longitudinal sectional view of the nozzle end of the gun.

In the drawings similar reference characters are used to designate corresponding parts in both of 'the views.

A conventional electric motor is shown at l to the casing of which is secured a pistol handle 2 through which an electric cable 3 extends, the. wires of said cable 3 being adapted to be connected with any suitable source of electric energy yto drive the motor 1. 4 designates, a conventional' electric switch .mounted on the handle 2 for controlling the current'to the motor 1. The motor shaft 5 extends through a tubular casing 6 secured to the casing of the motor 1 and .'30 has its extremity threaded as shown at 7 to engage the core 8 of a screw conveyor,

9 designating the spiral flange of the conveyor, the convolutions of said spiral flange 9 increasing in pitch from the end secured to the shaft 5 and the space between the convolutions of lthe spiral flange 9 being diminished coincident with the increase of pitch. i

A barrel 10 encloses the screw conveyor 4o and has at one end thereof an enlarged threaded portion 11 that `threadedly engages the outer end of the tubular member 6, While at its other end the barrel is provided with a conical portion 12provided with a delivery orifice 13 to discharge the contents of the barrel. 14 indicates a threaded member yengaging the conical portion 12 and adapted to lbe screwed into the orifice 13 to restrict,

the delivery opening as may be desired to control the delivery of material through the nozzle. The end ofthe core 8 secured to the shaft *5 is provided with a cylindrical head 15 that snugly engages the interior, of the barrel'lO and an enlarged portion 16 engages a shoulder 17 at the end of the barrel 10 and snugly engages the inner wall of the tubular member 6 to provide a fluid f tight joint to prevent the paint or other ma-V terial in the barrel from backing into the tubular member 6.

i 18 designates a reservoir to hold the paint or other liquid being supported on the tubular member 6 by means of a support 19, and

the reservoir 18 lisconnected with the inner end of the barrel 10 by means of a pipe20. 21 indicates a valve to control the flow of liquid from the reservoir 18, 22 a filling nozzle, and 23 a plug to close thefilling nozzle, said plug being rovided with a longitudinal opening 23a t at serves as a vent for the reservoir 18. y

In use it will be apparent that the device is portable and when the motor 1 is in operation the paint will be delivered through the nozzle orifice or opening 13 in a stream, or if the stream is restricted by adjustment of the screw member 14 the delivery of the material will be in thel form of a spray more or less finely divided' as will be required for the work to be performed.

What is claimed is 1. A paint gun, comprisingw a barrel, a i

reservoir communicating with the barrel adjacent to one end thereof, a. nozzle at4 the other end of the barrel a screw conveyor rotatably mounted in said barrel and arranged to deliver the contents of the barrel I to the nozzle, the pitch of the convolutions of the screw being increased from the reservoir communicating portion of the barrel to Ithe nozzle, a motor', a motor shaft driven by themotor and operatively connected to the screw conveyor, and means supporting said motor, the barrel andthe reservoir for manual movement. y

2. A paint gun, comprising a barrel, a reservoir communicating with the barrel adjacent to one end thereof, a nozzle at the other end of the barrel, an adjustable member to control the' .delivery of material through the nozzle, a screw conveyor rotatably mounted in the barrel and arranged to deliver the contents. of the barrel to the nozzle, the pitch of. the convolutions of the screw beingy increased from the reservoir communicating portion of the barrel to the y nozzle, a motor, means connecting the casin of the motor and-fthe barrel, avmotor sha driven by the motor and operatively connected to the screw conveyor, and a handle 5 member, a barrel secured to said member a reservoir supported on said member, a pipe connecting said reservoir and the secured end of the barrel, a nozzle at the otherI end of the barrel, ascrew conveyor in said barrel and arranged to deliver the contents of the barrel to the nozzle, the pitch of the convolutions of the screw being increased and the spaces between the convolutions decreased from the receiving end to the nozzle end of the conveyor to compress the material to drive it from the nozzle in a stream, an adjustable member to control the delivery of material from thenozzle, a. motor, the casing of the motor secured to said tubular member, a motor shaft driven by the motor and operatively connected to the screw conveyor, and .a handle secured to the motor casing.

In testimony whereof I alix my signature.

HENRY W. ROSE. 

